I think the correct answer you are looking for is the third option or Humid subtropical
Explanation:
Given the importance of oxygen for animals, researchers suspected that a sudden increase in the gas to near-modern levels in the ocean could have spurred the Cambrian explosion. ... This supported the idea of oxygen as a key trigger for the evolutionary explosion.
Answer:
this is a water fall I believe
The answer is D. photosynthesis
Photosynthesis is not considered as a process of the water cycle.